McDonalds surely will always take the cheap option. Only if their image is hurt they try to change something. A little bit.
As long as their food is not hazardous to health, I don't have any problem. But still, the thought of eating chicken nuggets, which are made from inner organs (such as kidneys, heart, and thyroid glands) and bones makes me nauseous (the last time I had chicken nuggets from McD was in 2011). Are you sure that eating these food products will not cause any serious health issues later?
As far as i read McDonalds stopped using that because the public outcry was too big.
And no, i dont know if that will bring problems to healt. The beauty for companies in the US is... they dont need to proof that something is not dangerous, they can use it until it shows that its dangerous. In europe companies would need to show that something is not dangerous. Then they can use it.
And with the free trade agreements these blessings to companies can be spread over the world. If people dont stand up against it.